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Photoperiod or Lighting Duration
For most aquariums, you will want to have the lights on for 10-12 hours per day, however, if you are growing live plants or live corals, you may want to increase this light duration to 12-14 hours per day.

Photoperiod: Refers to the number of consecutive hours that light occurs in a day. In the aquarium, it is the number of hours that the lights are kept on.
Photophore: Luminous organ found in fish.

Photoperiod: The length of time that the aquarium lights are on.
Phytoplankton: Microscopic plants found drifting in seawater.

The period of time that an aquariums lights remain on. For your basic Aquarium, it is recommended to only have the light on for 6 hours each day. Reef Tanks have seperate specifications depending on the life in the tank.

· Photoperiod = Gk word that is used for the periods of light and darkness within a day
· Photophore = Gk term for the organs that produce bioluminescence light of specific animals
· Piscivorus (pl. piscivores) = animal or invertebrate which feeds on fishes.

The ~ or amount of time you should leave your lights on is worth mention as well. A ~ of 10--12 hours is considered the best for plant tanks; use a timer to control consistency.

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Regularity of ~ can be very meaningful. Experiments have shown that long dark or light periods (1-2 days) severely affect aquatic life, photosynthetic and otherwise.
Use of Timers: Get them, they're great; and fixtures with self-starting features.

3. Controlled ~
Having too little light can be a cause of growth of the red algae as we previously saw. Too much light for extended periods in the aquarium can also mean that other unwanted algae can start growing.

'Cryptocaryon irritans (Ciliophora): ~ and Transmission in Marine Fish.' Journal of the Marine Biological Association of the United Kingdom, 74, 445-453, 1994b.
Burgess, P.J. & Matthews R.A. 'Fish Host Range of Seven Isolates of Cryptocaryon irritans (Ciliophora).

With lighting, we want to provide the proper ~, intensity, and spectrum for good coral and anemone growth. Most applications use a 12-hour ~. With multi-light systems, you can use timers to vary the intensity by varying the number of lights on at any one time.

- This can be difficult, but if possible, reduce the length or intensity of your ~. Opt for less light demanding and maintenance intensive plants. Or, switch to more efficient lights. LEDs are much more energy efficient and are just emerging as a viable alternative.

Keep feeds at regular hours, and make sure the ~ (lights on time!) is regular, around 12 hours a day ( reflective of equatorial times for most tropical fish, and this is most important for wild collected fish ), and if at all possible, graduate the change from dark to light.

For most aquarists, a simple, inexpensive 15 amp timer found at any hardware store will suffice for controlling the length of the ~.

Is lighting sufficiently intense for your plant choices, of good spectrum for plants, and for a long enough ~? Are you giving root plants such as swords and crypts and aponogetons some root fertilization? If your light levels are at 2 wpg or greater, are you supplying CO2?

Aquarium lights are best mounted inside reflector hoods, placed either directly on top of the tank's glass cover, or on a special frame above the tank. Some vendors have attached timers to these hoods to facilitate the setting of ~ exposures.

Sure, they don't crawl under the covers and go to sleep, but they do hunker down in a quite place and rest at night. They need this period without lights. A good ~ (time the lights are on) is around 10 hours per day. For more info on lighting, check out Aquarium Lighting - Fish Tank Light.

Use warmer 78°F water, well planted with finely leaved vegetation. The baby Zebra Danios grow quickly and reach maturity within eight months. ~ is very important 14 hours of light and 10 hours of dark will induce spawning.

red bunches are great as red accents or focal points in an aquascape. This plant adds sparkle to an aquarium by the way it pearls when in good condition�a multitude of glistening, pearly white orbs cover the lower surface of each leaf of this plant a few hours after the start of a ~.

grows so fast, that I have removed it from my own tanks, as it readily takes over. Limnophilia sessiliflora has an interesting habit. When the plant has received enough light for the day, the whorls of leaves tend to close up and "go to sleep". You can use this to help fine tune the ~ in ...

See also: See also: What is the meaning of Water, Aquarium, Fish, Plants, Temperature?

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